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H. L, McAVOY.

Steam Heater.

No. 93,104. Patented July 27, 1869.

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HUGH L. MCAVOY, OF BALTIMORE, MARYLAND.

Letters Patent No. 93,104, dated July 27 1869.

HEAT-REGULATOR FOR HOT-WATER APPARATUS.

The Schedule referred to in these Letters Patent and making part of thesame.

T 0 all whom it may concern Be it known that I, HUGH L. MGAVOY, of thecity of Baltimore, in the State of Maryland, have in-- vented a new anduseful Improvement in Heat-Begulators for Hot-Water and otherHeating-Apparatus; and I do hereby declare the following to be afull,clear, and exact description of the same, reference being had to theaccompanying drawing, which is made a part of this specification.

The object of my invention is to produce an automatic heat-regulator forhot-water and other heatingapparatus, which, being independent of theboiler, shall be adapted for all varieties of apparatus, and shall, atthe same time, be entirely reliable.

It consists of an isolated cylinder, or chamber, surrounded by the wateror steam of the apparatus, the heat of which is thus imparted to it, andprovided with a pair of tubcs,one extending about half way to thebottom, and provided, at its upper end, with a suitable cap or valve,through which the chamber is supplied with water, or other suitablefluid, and the other-extending below the surface of the fluid to nearthe bottom of the chamber, and'forming, or provided at its upper endwith a cylinder, or chamber containing a diaphragm or other piston, or afloat, on the bottom of which the fluid is caused to press, by theformation of steam and the rarefaction or expansion of the air withinthe chamber by unusual heat, the fluid rising through the last-namedtube.

The stem of the piston or float is connected, through suitable media, tothe draught and fuel: doors, or to a damper or dampers in the fines ofthe furnace, which it thus serves automatically to operate as required.

In the drawing- Figure 1 represents a front elevation of a waterheatingapparatus, provided with one form of my improved regulator.

Figure 2 is a side elevation thereof, partly in verticalsection.

A represents the boiler or heater, which maybe of any form;

A, the fire-space, and

A", the water-space thereof.

B represents an air-tight cylinder or Chamber, arranged in the form ofapparatus shown, within the Pater-space, being, however, entirelyisolated thererom.

O D are tubes or pipes, projecting downward in the cylinder orchamber B,asv represented in fig. 2, the

former'to about the centre, and the latter to near the bottom thereof.

The upper end of the tube 0 is closed, by means of a screw-cap, c, or asuitable valve, and is employed to supply the chamber with water, orother suitable" fluid, the introduction of'which is determined by itslength, the confined air in the space above itsend preventing the fluidrising much above that point.

The tube D forms, or is provided at its upper end with a cylinder, orchamber E, for the reception of a diaphragm, F, or other suitable pistonor float, the

stem f of which is connected to a lever, G, fulcrumed in a standard, e,and traversing, at its other end, a

- slotted standard, 0, rising from the cylinder E, or other convenientpart.

The ends of the lever G are connected by chains H H respectively, to thedraught-door a and fuel door a of the furnace, or through any suitablemedia, to a damper or dampers, by which the draught, &c., may becontrolled.

The chamber B maybe applied to the boiler, at any desired point thereof,either within or exterior thereto, by suitable connections.

The operation of the device, in the form represented, is as follows Thechamber B being applied to the boiler or heater, in suitable manner tobe surrounded by the water or steam thereof, is supplied with water, orother suitable fluid, through the tube (7, which is then closed.

Asthe water in the boiler becomes heated, its heat isimparted to thefluid and air in the chamber E, which are thus kept at about the sametemperature as the water and steam in the boiler.

On an, excessive heat being attained by the pressure caused by theaccumulation of steam, and the rarefaction and expansion of the heatedair above the surface of the fluid in the chamber B, said fluid will beforced up through the tube D, elevating the piston or float F, and,through its stem f, the lever G, de-

pressing the chain H, and closing the draught-door a,

which is held open by said chain.

Then, if the heat has not-by this been checked sufficiently by thecontinued rise of the piston or float, the fuel-door a will be opened,allowing the cold air to rush in on the fuel and the lire-surface,speedily restoring the boiler to the desired temperature.

On this being reached by the consequent contraction of the air in thechamber B, the-pist0n or float will fall, and the doors be restored totheir normal position.

My regulator, as employed in hot-water heatingapparatus, varies from allothers of similar nature, in the following very material respects:

All automatic regulators for hot-water heating-apparatus, prior to myinvention, have been of "such a character as to render impossible theconveyance of the water to heating-surfaces, such as radiators, 850,,above the boiler, for the reason that the water in the boiler was usedto operate the float.

My device being independent, is adapted to be ap plied to the boiler atany point, and consequently allows the water of the boiler to be carriedup to any desired height above it, without affecting its operation.

Having thus described my invention, the following is what I claim as newtherein, and desire to secure by Letters Patent:

I claim the combination, with a hot-water or other heating-apparatus, ofthe isolated chamber B, provided with the tubes 0 D, thediaphragm-piston'F, or its equivalent, and the lever G,-arranged toOperate substantially in the manner described, for the purposespeizifierl.

HUGH L. MOAVOY.

\Vitnesses WM. H. BRERET N, J r., J. L. Ewm.

